动态获取R.drawable.xx资源

String imageName = "index_fragmen"+getColor();
final int resId = context.getResources().getIdentifier(imageName, "drawable", context.getPackageName());
if (resId != 0) {
    Log.e("mytest", "可以获取到");
    holder.btnCoupon.setBackgroundResource(resId);
}

程序猿必读